This tower is as tall as that one. This picture is as beautiful as that one. Maria is smarter than Guido. There are a number of ways to compare two or more things in English, and the same is true for Italian.

Equality

Comparisons of equality, in which two Italian nouns, Italian adjectives, or Italian adverbs have the same characteristics, use the word pairs così...come or tanto...quanto:

Aldo è così diligente come Elena. (Aldo is as diligent as Elena.)

Luigi mangia tanto quanto Giorgio. (Luigi eats as much as Giorgio.)

Studiare è tanto difficilie quanto lavorare. (Studying is as difficult as working.)

When comparing nouns, the only the word pair tanto...quanto is used, and tanto must agree in number and gender with the noun it modifies:

Ho tanto denaro quanto tu. (I have as much money as you.)

Questo parco ha tanti alberi quanto l